Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/test/ui/associated-types/associated-types-project-from-hrtb-in-fn.rs b/src/test/ui/associated-types/associated-types-project-from-hrtb-in-fn.rs
new file mode 100644
index 000000000..1e23dd889
--- /dev/null
+++ b/src/test/ui/associated-types/associated-types-project-from-hrtb-in-fn.rs
@@ -0,0 +1,37 @@
+#![allow(dead_code, unused_variables)]
+// run-rustfix
+// Check projection of an associated type out of a higher-ranked trait-bound
+// in the context of a function signature.
+
+pub trait Foo<T> {
+    type A;
+
+    fn get(&self, t: T) -> Self::A;
+}
+
+fn foo2<I : for<'x> Foo<&'x isize>>(
+    x: I::A)
+    //~^ ERROR cannot use the associated type of a trait with uninferred generic parameters
+{
+    // This case is illegal because we have to instantiate `'x`, and
+    // we don't know what region to instantiate it with.
+    //
+    // This could perhaps be made equivalent to the examples below,
+    // specifically for fn signatures.
+}
+
+fn foo3<I : for<'x> Foo<&'x isize>>(
+    x: <I as Foo<&isize>>::A)
+{
+    // OK, in this case we spelled out the precise regions involved, though we left one of
+    // them anonymous.
+}
+
+fn foo4<'a, I : for<'x> Foo<&'x isize>>(
+    x: <I as Foo<&'a isize>>::A)
+{
+    // OK, in this case we spelled out the precise regions involved.
+}
+
+
+pub fn main() {}